Abstract
Aims
This study was conducted to investigate the influence of surgical experience on the outcomes and component positioning of total knee arthroplasty (TKA). We compared the outcomes and component positioning of simultaneous bilateral TKAs performed by supervisors and trainee surgeons.
Patients and Methods
A total of 20 patients (40 knees) who underwent simultaneous bilateral primary TKA using the same cruciate-retaining TKA system between 2011 and 2015 were included. The mean patient age was 76 years (range: 64 to 86 years). There were 2 males and 18 females. The first phase of the operation was performed on the knee that was more severely degenerated by one supervisor who had performed over 1000 TKAs. The other knee was operated on next by trainee surgeons who had performed less than 20 TKAs. The knees were categorized into two groups: those operated on by supervisors (group S) and those operated on by trainee surgeons (group T). Outcome measures included range of motion (ROM), Knee Score (KS), and Function Score (FS). We also evaluated operative time, alignment of the leg, and the orientation of components, which was determined on post-operative long-leg coronal films.
Results
The mean pre-operative maximal flexion was 119.8° in group T and 114.8° in group S (p=0.548). The mean pre-operative KS was 47.5 in group T and 35.6 in group S (p<0.01).
The mean operative time was 124.5 min in group T and 91.8 min in group S (p<0.01). The mean post-operative maximal flexion was 114.0° in group T and 113.0° in group S (p=0.967). The mean post-operative KS was 93.9 in group T and 92.9 in group S (p=0.978). There were no significant differences in the ROM and KS when comparing supervisor and trainee surgeons. The overall mean FS increased to 70 from 42.
The varus angle of the mean coronal tibial component was −1.12° in group T and 1.12° in group S (p<0.01). The varus angle of the mean coronal femoral component was 0.24° in group T and 1.82° in group S (p=0.0447). The mean FTA was 172.7° in group T and 176.4° in group S (p<0.01). The mean HKA was 179.2° in group T and 182.9° in group S (p<0.01).
Conclusions
Operative time was significantly longer for TKAs performed by trainee surgeons compared to those performed by supervisors. However, alignment for knees in the supervisor group were significantly more likely to be varus compared with those in the trainee group. This study showed no significant difference in ROM and KS between supervisors and trainee surgeons.
